feat(api): return post versions from GET /content/post/:slug

[bbornino]

Closes #192

What changed

GET /content/post/:slug now returns a versions array alongside the
existing collection field — the other versions of a post that share
its groupId.

• Added a new self-referential versions relation on posts in
  packages/db/src/relations.ts, keyed on the (nullable) groupId
  column. A post with no groupId naturally resolves to zero relation
  matches, so no special-casing is needed for that case.
• PostResponseSchema gained a versions: { slug, versionName, publishedAt }[] field.
• The route handler fetches each version's slug, versionName,
  versionOrder, and publishedAt, then sorts by versionOrder
  first and publishedAt as a tiebreaker, per the issue.

Notes

• The current post is intentionally excluded from its own versions
  list — the relation itself returns every post sharing the same
  groupId, including the post being requested, so the handler
  filters that entry out by slug before returning the array.
• Unpublished versions are filtered out, the same way unpublished
  collection chapters are already excluded from collection.chapters
  in this route, to avoid leaking draft slugs through a public
  endpoint.
• There's no createdAt column on posts (only editedAt and
  publishedAt), so publishedAt is reused as the version's date —
  same field name and value already exposed for the post itself and
  for collection chapters.

Test plan

• pnpm test:unit passes clean
• pnpm run build:all passes clean (full tsc type-check, not
  just vitest's esbuild transpile)
• pnpm prettier --check clean on changed files
• New test: a post with multiple versions, sorted by versionOrder
  then publishedAt, self excluded
• New test: a post with no groupId returns an empty versions array

[coderabbitai]

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